Geometry Crossword Puzzle

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Across
  1. 2. A straight line extending from the center of a circle to the circumference or surface
  2. 4. A triangle that has two equal sides
  3. 8. A quadrilateral with both pairs of opposite sides parallel to each other
  4. 9. A triangle with all sides and angles equal
  5. 10. The sum of two angles equals 90 degrees
  6. 11. An angle less than 90 degrees but greater than 0 degrees
  7. 12. A parallelogram that has four right angles
Down
  1. 1. A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
  2. 3. A triangle with three unequal sides and angles
  3. 5. The sum of two angles equals 180 degrees
  4. 6. Any polygon with four sides
  5. 7. An angle greater than 90 degrees but less than 180 degrees